基于平衡荷载的双向张弦梁下弦拉索找形方法

详细信息

THE FORM-FINDING METHOD BASED ON BALANCED LOAD OF THE DOWN STRING-NET OF BI-DIRECTIONAL BEAM-STRING STRUCTURE

(Central Research Institute of Building and Construction, MMC Group, Beijing 100088, China)

摘要: 基于双向张弦结构下弦拉索的平衡荷载与索曲面及索拉力之间的关系，给出了下弦拉索所在曲面的偏微分方程；首次根据下弦节点的平衡条件给出了计算下弦索网曲面形状的有限元列式并编制了计算程序；通过2个算例介绍了有限元法确定下弦曲面的方法和过程，并对找形后确定的张弦结构进行了受力分析，验证了找形结果的正确性。该文给出的计算方法物理意义明确、计算过程方便、计算结果准确。
- 平衡荷载 /
- 曲屋面 /
- 双向张弦结构 /
- 找形 /
- 有限元法
Abstract: The differential equation of the curved surface of down string-nets of bi-directional beam-string structures is deduced by the relationship of balanced loads and by the form of string-nets and the tensions of the strings. The FEM and corresponding program to calculate the curved string-net surface is provided according to the equilibrium condition of cable-nets. The FEM process to calculate the net surface is introduced by 2 examples. The method is of definite physical meanings and easy to carry out with accurate results.
- balanced load /
- curved roof /
- bi-directional string structure /
- form-finding /
- FEM